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  1. PNWExpress

    Chevy/GMC 4x4 Van - Fuel Mileage

    It's taller than a stock Express. I've never measure to see how much.
  2. PNWExpress

    Chevy/GMC 4x4 Van - Fuel Mileage

    We have a 2014 3500 6.0 with a Quigley conversion with 140k miles on the clock. Cruising on the hwy under 70mph we average about 17mpg, streets 12-14mpg. We're pretty light footed.
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